Hi! I'm a girl!
I have an 870 Wingmaster I used to use to shoot clays. It was a bit heavy to swing all day, so I switched out the wood furniture for some synthetic. It made it a little easier to point and swing for a full day of clays but I soon bought a Beretta A400 Lite. It's light, and easy to carry and the Kickoff system helps mitigate recoil. It's just over 6 1/2 lbs. She's more than welcome to try mine.
For new shooters in general, I'd suggest trying to find a 12ga that fits as you do make hitting clays more difficult when you change gauges.
A lot of the newer semi autos have some sort of recoil system which might take just enough off of the kick to be manageable for her.
Let me know when we're all meeting up at Clinton and I'll bring mine!
Best,
Rhi